To provide a bamboo hat of a cylindrical shape balloon structure which can be conveniently carried by reducing weight by reducing used members as much as possible, which has a structure rigid enough to be endurable to weak wind and rain, in which welded parts have all linear shapes for making it easy to manufacture, and which can easily be attached and detached without using cords and belts or others for attaching.

The cover part of the bamboo hat is formed of a thin film of a conical shape for making it easy to manufacture and lightweight and a framework is constituted by assembling four elongate cylindrical balloons with check valves into a parallel-cross shape and fixed to the bottom face of the bamboo hat. The size of the center of the parallel-cross shape constituted by assembling the four cylindrical balloons is made little bit smaller than a head such that the hat can easily be attached and detached, the hat can be fixed and used only by inserting the head into the center of the parallel-cross shape.